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4(r+9)=47
We move all terms to the left:
4(r+9)-(47)=0
We multiply parentheses
4r+36-47=0
We add all the numbers together, and all the variables
4r-11=0
We move all terms containing r to the left, all other terms to the right
4r=11
r=11/4
r=2+3/4
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